EP0561859A1 - Injecteur de carburant. - Google Patents

Injecteur de carburant.

Info

Publication number
EP0561859A1
EP0561859A1 EP92900246A EP92900246A EP0561859A1 EP 0561859 A1 EP0561859 A1 EP 0561859A1 EP 92900246 A EP92900246 A EP 92900246A EP 92900246 A EP92900246 A EP 92900246A EP 0561859 A1 EP0561859 A1 EP 0561859A1
Authority
EP
European Patent Office
Prior art keywords
axially aligned
armature
solenoid
valve seat
fuel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92900246A
Other languages
German (de)
English (en)
Other versions
EP0561859B1 (fr
Inventor
Mark Steven Cerny
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0561859A1 publication Critical patent/EP0561859A1/fr
Application granted granted Critical
Publication of EP0561859B1 publication Critical patent/EP0561859B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/066—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve

Definitions

  • This invention relates to high pressure valves in general and more particularly to high pressure fuel injector valves for internal combustion engines.
  • the terminals of the solenoid coil are typically brought out of the injector through an end cap.
  • the terminals may be suitable for connection to a connector or may be suitable to receive wire terminals. In either event, the terminals must be insulated from the main body of the injector. This is so since most injectors are fabricated from a metal housing and are located in the engine block or manifold.
  • end caps are molded from a plastic material.
  • plastic materials either thermoset or thermoplastic materials, solve both the insulating problem and the also are solid enough to be leak proof.
  • FIG 1 is a cross section view of a high pressure fuel injector
  • FIG 2 is a plan view of a spray generator
  • FIG 3 is a sectional view taken along line 3-3 of FIG 2;
  • FIG 4 is a sectional view taken along line 4-4 of FIG
  • FIG 5 is an enlarged cross section of the spray generator and valve seat of the injector of FIG 1.
  • a high pressure injector 10 designed to operate at fuel pressures over 1000 psi.
  • the injector includes a tubular housing member 12 made from nonmagnetic stainless steel.
  • the inside of the tubular housing member 12 has a plurality of different diameters to form different shoulders for different functions as will be hereinafter explained.
  • Position along the outside of the housing member 12 and on either side of the inlet 14 are sealing means 16, 18 to seal the injector 10 in the bore of the engine or manifold where it is located.
  • the housing member 12 has an open end 20 and an outlet end 22 enclosing a >
  • valve seat 24 containing an orifice 27.
  • the outlet end 22 is counterbored to form a shoulder 26 for locating the valve seat 24 and spray generator 28.
  • the valve seat 24 is swaged in the housing member 12 for locating the valve seat 24 and spray generator 28 against the shoulder 26 at the end of the counterbore.
  • the valve seat 24 has a sealing means 30 such as a c-shaped metal seal to prevent leakage of fuel from around the valve seat 24.
  • the c-shaped metal seal 30 is a very high temperature seal which will not break down because of the high temperatures at the outlet end 22 of the injector 10.
  • Adjacent to the valve seat 24 is the spray generator 28 having an axially aligned bore 32 through which reciprocates a needle valve 34.
  • the spray generator 28 has a radial extending seal 36 between itself and the housing member 12 inner surface.
  • the needle valve 34 has a spherical radius for mating with the valve seat 24 to close the injector 10. At the end of the needle valve 34 opposite the spherical radius, there is a collar 38 supporting an armature means 40 comprising a damping member 42 and an armature member 44.
  • the armature member 44 is located on the needle valve 34 butting against the damping member 42 and is free to move, ever so slightly, axially along the needle valve 34 against the damping member 42 which may be a belleville washer.
  • the end of the needle valve 34 is received in a spring retainer 46 which is slidably received in a bore 48 in the inner pole 50 of the solenoid core.
  • the solenoid core is of a circular core configuration, wherein the inner pole 50 is concentric with the outer pole 52 and the pole members are joined at the end opposite the end facing the armature member 44.
  • the cross-sectional areas of the inner 50 and outer poles 52 of the core are substantially equal.
  • the inner pole 50 has the bore 48 extending therethrough for receiving a bias spring 54.
  • the inner pole 50 is recessed from the plane passing through the ends of the outer pole 54.
  • a coil 56 wound around a bobbin member 58 as shown which is a wet coil construction or may be an completely encapsulated winding or overmolded winding, resulting in a dry coil construction.
  • Wet and dry coil construction refers to whether or not fuel comes in contact with the winding.
  • the solenoid is located against the inner surface 60 of the tubular housing member 12 between the open end 20 and a shoulder 62 radially extending along the inner surface 60 of the housing member. Positioned against the armature end of the solenoid and the shoulder 62 is a spacing ring 64. As well be seen the spacing ring 64 provides the proper amount of static fuel flow from the injector 10 by limiting the lift of the needle valve 34 to a maximum amount.
  • the armature member 44 is a circular member having a central hub 66.
  • the armature member 44 extends across the ends of the solenoid core and is of light mass. In order to lighten up the mass of the armature member and not reduce its magnetic function, several openings are provided between the outer peripheral surface of the armature member 44 and its central hub 66. These openings are typically equally spaced along a radius of the armature member 44. Since the housing member 12 is nonmagnetic, the magnetic lines of flux flow from the coil 56 through the inner pole 50 of the solenoid across the air gap adjacent to the armature member 44, through the armature member to the air gap adjacent the outer pole 52 of the solenoid and back to the coil 56. By recessing the inner pole 50, the closing time of the injector 10 is changed without significantly effecting the opening time of the injector.
  • the end cap 68 is positioned against the inner surface 60 of the housing member 12 and abuts the one end of the solenoid core.
  • An o-ring 70 is positioned along the outside axial surface of the end cap 68 and between the end cap 68 and the inner surface 60 of the housing member 12 to prevent fluid passing thereby.
  • the end cap 68 is located against the solenoid core by means of a ring 72 having threads 74 along its outside periphery which engage similar threads 76 on the inner surface 60 of the housing member 12 at the open end 20. As the threaded ring 72 is tightened, the end cap 68 bears against the solenoid core 50, 52 which bears against the spacing ring 64 which bears against the shoulder 62 of the housing member 12.
  • the end cap 68 also functions to enclose the axial bore 48 of the inner pole 50 containing the bias spring 54.
  • the function of the bias spring 54 is to bias the needle valve 34 against the valve seat 24 thereby closing the injector 10.
  • the amount of bias or spring force determines the closing time of the injector and the closing force of the valve needle on the valve seat.
  • a pair of terminals 78, 80 are secured to the ends of the coil 56 and extend through a pair of openings in the end cap 68. since the terminals 78, 80 are also of an electrically conducting material, they must be insulated from the end cap 68.
  • the openings are each a series of bores and counterbores and in FIG 1 there is one through bore 82, a counterbore 84 extending from the inside surface of the end cap 68 intermediate the ends of the through bore 82 and a third larger bore 86 extending from the inside surface of the end cap 68 part way axially along the counterbore 84.
  • the function of the counterbore 84 is form a shoulder 88 to retain the insulating means.
  • the insulating means functions to insulate the terminals 78, 80 from the end cap 68 and also to secure an o-ring 90 to prevent flow of fuel out of the terminal end.
  • the insulating means are two piece tubular members 92, 94 of 30% glass filled nylon each having a central bore and a counterbore extending intermediate its ends.
  • the first tubular member 92 has a radially extending surface forming a surface for abutting the shoulder 88 formed by the counterbore 84 in the end cap 68.
  • the second tubular member 94 has a smooth outer surface which functions to locate the second tubular member 94 in the counterbore 84 of the end cap 68.
  • Each of the terminals 78, 80 has a pair of spaced apart rings 96 positioned axially along the terminal. Positioned between the rings on the terminal is a sealing means or o-ring 90 to prevent the flow of fuel out along the terminal.
  • the first tubular member 92 of the insulating means encloses the ring 96 nearest the terminal end and extends along the terminal to insulate the terminal from the end cap 68.
  • the second tubular member 94 of the insulating means encloses the second ring 96 and insulates the second ring from the end cap 68.
  • the pressure from within the injector 10 bears against the second tubular member 94 of the insulating means and forces the second tubular member 94 against the ring 96 on the terminal forcing the terminal and the first tubular member 92 against the shoulder 88 formed by the counterbore 84 in the end cap 68.
  • threaded hole 98 along the axis of the end cap 68.
  • This hole 98 is capable of receiving a threaded member from a connector which may be used to connect the terminals 78, 80 from the coil to an external circuit.
  • the threaded hole 98 may also receive a end cap removal member, not shown, which will assist in the removal of the end cap 68 after the threaded ring 72 is removed. This may be necessary to change the bias spring 54, the spacer 64, or for any maintenance which might be necessary to the injector 10.
  • the swirl means in the illustrated embodiment, are a plurality of pairs of passageways 100, 102 intersecting each other as shown in FIG 3.
  • the fuel flows from the inlet 14 of the housing member 12 toward the outlet end 22 when the valve is open, the fuel flows along the first axially aligned passageway 100, see FIG 4, and then through the second inclined passageway 102, FIG 3, which is tangentially inclined to the central bore 32 of the spray generator 28 of the injector 10 to form a swirl pattern.
  • the fuel then flows along the inside surface of the valve seat 24 and out of the orifice 27 of the valve seat 24 as may be seen in FIG 5. As the fuel leaves the orifice 27, it forms a solid conical spray pattern.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Un bouchon métallique (68) destiné à un injecteur de carburant haute pression empêche les fuites de carburant dues aux pressions élevées à l'intérieur de l'injecteur. Les bornes (78, 80) de l'électro-aimant sont isolées du bouchon (68) au moyen de plusieurs entretoises isolantes (92, 94) situées de part et d'autre d'un joint torique haute pression (90). L'étanchéité entre le bouchon métallique (68) et le corps (12) de l'injecteur est assurée par un joint torique haute pression (70).
EP92900246A 1990-12-12 1991-12-09 Injecteur de carburant Expired - Lifetime EP0561859B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US626505 1990-12-12
US07/626,505 US5114077A (en) 1990-12-12 1990-12-12 Fuel injector end cap
PCT/EP1991/002356 WO1992010665A1 (fr) 1990-12-12 1991-12-09 Bouchon pour injecteur de carburant

Publications (2)

Publication Number Publication Date
EP0561859A1 true EP0561859A1 (fr) 1993-09-29
EP0561859B1 EP0561859B1 (fr) 1995-03-08

Family

ID=24510657

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92900246A Expired - Lifetime EP0561859B1 (fr) 1990-12-12 1991-12-09 Injecteur de carburant

Country Status (5)

Country Link
US (1) US5114077A (fr)
EP (1) EP0561859B1 (fr)
JP (1) JPH06503393A (fr)
DE (1) DE69108053T2 (fr)
WO (1) WO1992010665A1 (fr)

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Also Published As

Publication number Publication date
DE69108053D1 (de) 1995-04-13
DE69108053T2 (de) 1995-08-24
WO1992010665A1 (fr) 1992-06-25
JPH06503393A (ja) 1994-04-14
US5114077A (en) 1992-05-19
EP0561859B1 (fr) 1995-03-08

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